"The Justice Department recently won a court battle to keep an Internet company from talking about federal demands for user data, arguing that even disclosing the company’s name would damage national security," write Jennifer Valentino-DeVries and Danny Yadron at the WSJ Digits blog. "But then, after months of arguments, the department appears to have been foiled by its own redaction process, which left the name 'Google' on one page that was posted Friday in the U.S. District Court for the Southern District of New York."